[fix]: fix cursor link to be copy pastable

[Kylejeong2]

What

Fix the cursor link to be copy pastable.

[greptile-apps]

Greptile Summary

This PR makes two key changes to improve the usability of the Cursor deep link integration:

1. Improves the README.md presentation of the Cursor deep link by moving it from an inline format to a dedicated code block with clear instructions, making it easier for users to copy the link accurately.

2. Updates package.json to include 'assets' and 'README.md' in the published npm package by adding them to the 'files' array, ensuring all necessary resources are available to end users after installation.

These changes work together to enhance the user experience when using Cursor deep links with the package, addressing a practical usability issue where users might have had trouble accurately copying the link.

Confidence score: 5/5

1. This PR is very safe to merge as it only affects documentation and package distribution configuration.
2. The changes are straightforward, well-documented, and don't impact any runtime behavior.
3. No files need special attention as the changes are isolated to documentation and package configuration.

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